JPH08218472A - Air intake structure in vacuum type sewage collection system - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the vacuum valve is opened, the inside of the vacuum valve mass is prevented from becoming negative pressure regardless of the installation distance of the air intake pipe. Reliably prevent negative pressure from propagating to the trap. [Structure] A sewage sump 7 is formed in an invert 3A of a vacuum valve mass 3 in which a vacuum valve 4 is arranged, and sewage generated by a sewage generation source 9 is caused to flow down to the sewage sump 7 by a sewage inflow pipe 10. In the vacuum type sewage collection system provided with an air intake pipe 13 that introduces the atmosphere into the vacuum valve mass 3, the outlet of the air intake pipe 13 is configured so that the waste water in the waste water reservoir 7 is sucked by opening the valve. 13B communicates with the suction pipe 6 in the waste water reservoir 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air intake structure in a vacuum type sewage collection system, and more specifically, it has a function of preventing a negative pressure generated in a vacuum valve mass from propagating to a sewage inflow pipe. Regarding the air intake structure.

[0002]

2. Description of the Related Art As a conventional vacuum type sewage collection system of this type, the applicant of the present invention has proposed the prior art described in Japanese Utility Model Publication No. 6-14287. This vacuum type sewage collection system, as shown in FIG. 4, includes a sewage collection field 2 equipped with a vacuum pump 1 and a vacuum valve 4 arranged in a vacuum valve mass 3.
4A and the outlet 4A of the vacuum valve 4 are communicated with each other through the vacuum sewer pipe 5, and the inlet 4B of the vacuum valve 4 is communicated by the suction pipe 6 with the waste water reservoir 7 recessed in the bottom portion (invert) 3A of the vacuum valve mass 3. At the same time, air that is configured to cause the wastewater generated at the wastewater source 9 such as the sink, toilet, sanitary equipment of the private house 8 to flow down to the wastewater reservoir 7 by the wastewater inflow pipe 10 and to introduce the atmosphere into the vacuum valve mass 3 The structure is such that an intake pipe 13 is provided.

In the vacuum type sewage collection system configured as described above, sewage (domestic drainage or sewage) generated at the sewage source 9 of the private house 8 is discharged to the sewage reservoir 7 through the sewage inflow pipe 10. . When the water level in the dirty water reservoir 7 rises to the vacuum valve operating water level HWL, the air pressure in the water level detection pipe 11 rises. This increase in air pressure is applied to the vacuum valve control means 12 to open the vacuum valve 4. As a result, the sewage in the sewage reservoir 7 is sucked into the vacuum sewer pipe 5 through the path from the suction pipe 6 to the open vacuum valve 4. As a result, the level of sewage in the sewage sump 7 drops to a level lower than the lower end opening 11A of the water level detection pipe 11, and when the lower end opening 11A is exposed,
The pressure in the water level detection pipe 11 is lowered, the pressure drop is transmitted to the vacuum valve control means 12 and the water level is further lowered while the vacuum valve 4 is closed, and the lower end opening 6A of the suction pipe 6 is exposed. The valve is closed after air is taken in for a certain period of time. In the vacuum type sewage collection system, in order to effectively convey the sewage in the vacuum sewage pipe 5, it is necessary to suck a certain amount of air after sucking the sewage or at the time of sucking the sewage.

By the way, as described above, when the lower end opening 6A of the suction pipe 6 is exposed and the air in the vacuum valve mass 3 is sucked, the inside of the vacuum valve mass 3 becomes negative pressure. In this case, if the air intake structure is such that the laying distance of the air intake pipe 13 is shortened and the inlet 13A is set near the vacuum valve mass 3, the air intake pipe 13 introduces the atmosphere into the vacuum valve mass. The negative pressure of 3 can be kept small. However, in the air intake structure in which the laying distance of the air intake pipe 13 becomes long due to road conditions, etc., and the inlet 13A is set far away from the vacuum valve mass 3, the air into the vacuum valve mass 3 is The amount taken in is small, and the effect of suppressing negative pressure in the vacuum valve mass 3 is small. Therefore, the negative pressure in the vacuum valve mass 3 is the negative pressure in the wastewater inflow pipe 1
0, it is propagated to the trap of the sewage source 9 of the private house 8 and sucks the trapped water in the trap to lower the water level,
Alternatively, there is a risk that the trap may be damaged or the like may be adversely affected.

[0005]

The problem to be solved by the present invention is that in the conventional air intake structure in the vacuum type sewage collection system, when the installation distance of the air intake pipe becomes long, the vacuum valve is opened to open the vacuum valve. When the inside of the mass becomes negative pressure, this negative pressure is propagated to the trap of the sewage source of the private house via the sewage inflow pipe, sucking the trapped water in the trap to lower the water level or damage the trap. That is, there is a possibility that adverse effects such as

[0006]

According to the present invention, a sewage collection field equipped with a vacuum pump and an outlet of a vacuum valve arranged in a vacuum valve mass are communicated with each other by a vacuum sewer pipe, and the inlet of the vacuum valve is sucked. A pipe is connected to the wastewater reservoir formed at the bottom of the vacuum valve mass, and the wastewater generated at the wastewater source is configured to flow down to the wastewater reservoir in the vacuum valve mass by the wastewater inlet pipe. In a vacuum type sewage collection system provided with an air intake pipe for introducing the atmosphere into the waste water, the outlet of the air intake pipe is connected to the suction pipe in the waste water reservoir, and the vacuum valve is a valve. Even if it is opened, the inside of the vacuum valve mass is not made negative pressure regardless of the installation distance of the air intake pipe, and the negative pressure is surely prevented from propagating to traps such as the wastewater inflow pipe and the wastewater generation source. The purpose of Form was.

[0007]

According to the present invention, when the water level in the waste water pool rises to a predetermined water level, the air pressure in the water level detection pipe rises, and this rise in air pressure is applied to the vacuum valve control means to open the vacuum valve. As a result, the sewage in the sewage reservoir is sucked into the vacuum sewer pipe through the path from the suction pipe to the open vacuum valve. As a result, if the level of sewage in the sewage reservoir is lower than the upper end of the outlet of the air intake pipe, that is, the upper end of the communication part between the air intake pipe and the suction pipe, the sewage in the sewage reservoir is discharged from the air intake pipe. The air from the air intake pipe is mixed with the air and sucked in, as the level of the sewage in the sewage sump falls to the lower end of the outlet of the air intake pipe, that is, the lower end of the communication part between the air intake pipe and the suction pipe. The water level decreases to the lower end of the suction pipe while the suction amount increases. In this way, when the level of the sewage in the sewage pool drops to the lower end of the suction pipe, the pressure in the water level detection pipe also drops, and the pressure is transmitted to the vacuum valve control means to close the vacuum valve. Therefore, almost all of the air sucked from the suction pipe is sucked from the air suction pipe.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the invention of claim 1 will be described below with reference to the drawings. The same or corresponding parts as those of the conventional example described in FIG. 2 are designated by the same reference numerals, and detailed description of the structure and operation will be omitted. FIG. 1 shows an embodiment of the present invention, in which an outlet 13B of an air intake pipe 13 is communicated with a suction pipe 6 in a wastewater sump 7. That is, the air intake pipe 1 is at a level below the maximum water level HHWL of the waste water pool 7.
The outlet 13B of 3 is connected to the suction pipe 6.

With such a construction, when the water level in the waste water reservoir 7 rises to the vacuum valve operating water level HWL, the air pressure in the water level detecting pipe 11 rises, and this rise in air pressure is applied to the vacuum valve control means 12 to cause a vacuum. The valve 4 is opened. as a result,
The sewage in the sewage reservoir 7 is the suction pipe 6 → the vacuum valve 4 that is open.
It is sucked into the vacuum sewer pipe 5 through the path. As a result, the level of sewage in the sewage sump 7 is set to the outlet 13B of the air intake pipe 13.
Is lower than the upper end LWL1 of the communication portion between the air intake pipe 13 and the suction pipe 6, the air is mixed and sucked from the air intake pipe 13 together with the waste water in the waste water reservoir 7, As the level of dirty water decreases to the lower end of the outlet 13B of the air intake pipe 13, that is, to the lower end LWL2 of the communication portion between the air intake pipe 13 and the intake pipe 6, the air intake amount from the air intake pipe 13 increases. Meanwhile, the level of the dirty water is lowered to the lower end opening 6A of the suction pipe 6. Along with this, the water level detection pipe 11
The internal pressure also drops, and the pressure is transmitted to the vacuum valve control means 12 to close the vacuum valve 4. Therefore, almost all the air sucked from the suction pipe 6 is sucked from the air intake pipe 13.

As described above, even if the vacuum valve 4 is opened, the inside of the vacuum valve mass 3 is not made negative pressure. As a result, it is possible to reliably prevent the negative pressure from propagating to the traps of the sewage inflow pipe 10 and the sewage generation source 9, suck the accumulated water in the traps to lower the water level, or damage the traps. It is possible to avoid the occurrence of inconvenience that adversely affects. Moreover, since the negative pressure in the vacuum valve mass 3 is performed regardless of the installation distance of the air intake pipe 13, it is possible to relax the restriction on the position setting of the inlet 13A when the air intake pipe 13 is installed.

As shown in FIG. 2, the air intake pipe 13
By disposing the intervening member 14 above the communication portion 13C, it is possible to prevent filth from adhering to the communication portion 13C.

Further, according to the present invention, the maximum water level H of the waste water reservoir 7 is
Outlet 13 of air intake pipe 13 at any level below HWL
Since B can be communicated with the suction pipe 6, for example, as shown in FIG. 3, by setting the vacuum valve operating water level HWL to the intermediate position in the height direction of the outlet 13B of the air intake pipe 13, the vacuum valve The air can be sucked in at the same time when the valve of 4 is opened.

[0013]

As described above, according to the present invention, since the outlet of the air intake pipe is communicated with the suction pipe in the waste water reservoir, the air intake pipe can be installed even if the vacuum valve is opened. No negative pressure is created inside the vacuum valve mass regardless of the distance. As a result, it is possible to reliably prevent the negative pressure from being transmitted to the sewage inflow pipe and the trap of the sewage generation source, suck the accumulated water in the trap on the sewage generation source side to lower the water level, or It is possible to avoid the occurrence of inconvenience such as the damage of the trap on the side, which has an adverse effect.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a configuration diagram showing a modified example of the present invention.

FIG. 4 is a configuration diagram of a conventional example.

[Explanation of symbols]

 1 Vacuum Pump 2 Sewage Collection Site 3 Vacuum Valve Mass 3A Invert (Bottom of Vacuum Valve Mass) 4 Vacuum Valve 4A Vacuum Valve Outlet 4B Vacuum Valve Inlet 5 Vacuum Sewage Pipe 6 Suction Pipe 7 Sewage Reservoir 9 Sewage Source 10 Sewage Inflow Pipe 13 Air intake pipe 13B Air intake pipe outlet

Claims (1)

[Claims] 1. A sewage collection field equipped with a vacuum pump and an outlet of a vacuum valve arranged in a vacuum valve mass are communicated with each other by a vacuum sewer pipe, and an inlet of the vacuum valve is a suction pipe at the bottom of the vacuum valve mass. Is connected to the sewage pool formed in the above, and the sewage generated at the sewage generation source is configured to flow down to the sewage pool in the vacuum valve mass by the sewage inflow pipe, and the air intake for introducing the atmosphere into the vacuum valve mass. In a vacuum type sewage collection system provided with a pipe, an outlet of the air intake pipe is communicated with the suction pipe in the waste water reservoir, the air intake structure in the vacuum type sewage collection system.